I know most people here aren't concerned with this aspect (I don't comp myself, but I personally prefer a scale-appearing tire) but they are still the first tire mentioned on the SORRCA list of banned tires:
"Tire Ban List: • Losi Claws (all sizes, and types) • Hot Bodies Rovers (all sizes) • Hot Bodies Sedonas • HPI Rock Grabbers • Panther Cougars • Panther Leopards • Pro-Line Chisels (all sizes) • RC4WD Rocklin • RC4WD X-Locks (all sizes) • RC4WD Crazy Crawlers • Imex Skulls and Bones • Losi Bashers."
Also, Losi pretty much got out of the crawling game except for the Night Crawler - which currently comes with TSL Swampers left over from the Vaterra Ascender line. The Team Losi Racing Comp Crawler came with the Claws, which were National Champion winners in the old USRCCA days.
Nowadays Losi does the go-fast stuff, Vaterra is dead and gone, and Axial gets all the crawler glory - all under the Horizon Hobby banner - and Pro-line got snatched up, too!